nanog mailing list archives
Re: Dual Homed BGP
From: Jay Hennigan <jay () west net>
Date: Fri, 24 Jan 2020 13:45:05 -0800
On 1/23/20 16:01, Brian wrote:
Hello all. I am having a hard time trying to articulate why a Dual Home ISP should have full tables. My understanding has always been that full tables when dual homed allow much more control. Especially in helping to prevent Async routes.
If you're multi-homed you'll have some asymmetric routes. Even if you aren't, they'll be asymmetric to your upstream. It's easy to manipulate which path traffic leaving your site takes, difficult or impossible to manipulate via which path it enters.
If you have sufficient horsepower and memory in your routers, taking full tables won't hurt anything and will help in situations where one of your upstreams loses reachability to a destination. For belt-and-suspenders, take full routes plus a default.
Am I crazy?
Perhaps, but if so it has little if any relationship to the size of the BGP tables in your border routers.
-- Jay Hennigan - jay () west net Network Engineering - CCIE #7880 503 897-8550 - WB6RDV
Current thread:
- Dual Homed BGP Brian (Jan 24)
- Re: Dual Homed BGP Mel Beckman (Jan 24)
- Re: Dual Homed BGP Ben Cannon (Jan 24)
- Re: Dual Homed BGP Cummings, Chris (Jan 24)
- Re: Dual Homed BGP Ben Cannon (Jan 24)
- Re: Dual Homed BGP Job Snijders (Jan 24)
- Re: Dual Homed BGP Chriztoffer Hansen (Jan 24)
- Re: Dual Homed BGP Amir Herzberg (Jan 27)
- Re: Dual Homed BGP Jay Hennigan (Jan 24)
- Re: Dual Homed BGP Gavin Henry (Jan 24)
- Re: Dual Homed BGP Baldur Norddahl (Jan 24)
- Re: Dual Homed BGP Jon Lewis (Jan 24)
- Re: Dual Homed BGP Baldur Norddahl (Jan 24)
- Re: Dual Homed BGP Tore Anderson (Jan 25)
- Re: Dual Homed BGP Baldur Norddahl (Jan 25)
- RE: Dual Homed BGP Aaron Gould (Jan 25)
- Re: Dual Homed BGP Anurag Bhatia (Jan 27)
- Re: Dual Homed BGP Jon Lewis (Jan 24)
- Re: Dual Homed BGP Mel Beckman (Jan 24)